Honestly, I'd say as a whole, Voyager and Enterprise had superior 2-and-multi-part episodes than TNG, at least as far as ones I enjoy.

For me, #1 definitely goes to Best of Both Worlds, with Encounter at Farpoint in second and All Good Things in third. Beyond that, they are either okay (Unification, Redemption, Gambit) or ones I don't really enjoy like Chain of Command and Time's Arrow.